Transaction yielding output might not be registered anymore

[JeremyPansier]

Add an expiry time using:

	info, _ := proofOfHumanity.PohCaller.GetSubmissionInfo(nil, common.HexToAddress(address))
	submissionTime := time.Unix(int64(info.SubmissionTime), 0)
	fmt.Println("registration date", submissionTime.Format("01-02-2006 15:04:05"))
	submissionDurationSeconds, _ := proofOfHumanity.PohCaller.SubmissionDuration(nil)
	submissionDuration := time.Duration(submissionDurationSeconds) * time.Second
	expiryTime := submissionTime.Add(submissionDuration)
	remainingDuration := expiryTime.Sub(time.Now())
	fmt.Println("remaining time:", remainingDuration)
	fmt.Println("remaining days:", remainingDuration.Hours()/24)
	fmt.Println("remaining months:", remainingDuration.Hours()/24/30)
```